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Engineering :: Heat Transfer


1.  Select the only wrong statement.
A. heat can be converted into work B. heat can be reflected by a mirror
C. heat waves cannot pass through vacuum D. heat is a form of energy

2.  Which of the following is a form of energy?
A. pressure B. momentum
C. light D. power

3.  When heats is transferred by a chain of molecules from the hot area of an object to a colder area the process of heat transfer is called
A. natural convection B. forced convection
C. conduction D. radiation

4.  Heat transfer by conduction is described to
A. Fouriers law B. Newtons law of cooling
C. Stefan Boltzmann law D. Ficks law

5.  Heat transfer by conduction is directly proportional to
A. (thermal potential difference)/(thermal resistance) B. (thermal resistance)/(thermal potential difference)
C. (thermal potential difference)(thermal resistance) D. thermal resistance

6.  Whenever there is a temperature difference
A. heat will be transferred from hotter object to colder object B. heat will be transferred from colder object to hotter object
C. heat will not be transferred D. none of these answers

7.  The units of thermal conductivity in SI unit are
A. W/(m.K) B. J/(m.K)
C. W/(m2.K) D. J/(m2.K)

8.  The thermal conductivity of a gas
A. decreases with increasing temperature B. increases with increasing temperature
C. is independent of temperature and pressure D. is greater than the thermal conductivity of water at the same temperature

9.  The thermal conductivity of water
A. remains unaffected with change in temperature B. decreases with increase in temperature upto about 300?F
C. increases with increase in temperature upto about 300?F D. is less than the thermal conductivity of air at the same temperature

10.  If ks kl and kg are the thermal conductivities of aluminium water and air at the same temperature then
A. ks > kl > kg B. kg > kl > ks
C. ks > kg > kl D. kl > ks > kg




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